/*
 * @Author: your name
 * @Date: 2021-08-16 07:40:06
 * @LastEditTime: 2021-08-18 11:22:05
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: \系统学习\VueProject\vue02\supermall\src\common\utils.js
 */
export function debounce(func,delay){
    let timer = null
    return function(...args){
      if(timer) clearTimeout(timer)
      timer = setTimeout(() => {
        func.apply(this,args)
      },delay)
    }
}

// 时间戳转化
export function formatDate(date, fmt) {
  // 1. 获取年份
  if(/(y+)/.test(fmt)) {
    fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length));
  }
  // 2. 获取
  // M+ -> 正则表达式中的一个规则
  let o = {
    'M+': date.getMonth() + 1,
    'd+': date.getDate(),
    'h+': date.getHours(),
    'm+': date.getMinutes(),
    's+': date.getSeconds()
  };
  for (let k in o) {
    if (new RegExp(`(${k})`).test(fmt)) {
      let str = o[k] + '';
      fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? str : padLeftZero(str));
    }
  }
  return fmt;
}
function padLeftZero (str) {
  return ('00' + str).substr(str.length);
}